#2 Abrupt change of monostatic RCS as a function of frequency

[Anonymous]

When calculating the monostatic RCS of a metal cube with edge length L = 50 mm as a function of frequency f, the RCS shows the expected behaviour of RCS ~ f^2 for frequencies f < 23.4 GHz.
For frequencies above 23.4 GHz. This is equivalent to k0 * L = 24.5.
I am using the mesh coming with Puma in the /geo folder and setting the edge length of via the lx, ly and lz parameters in simulation_parameters.py. The mesh is set to have a "fineness" of lambda/10.

What kind of problem can occur at relatively high frequencies k0 * L >> 1?

Best regards!

[Anonymous]

[Idesbald Van den Bosch]

Dear,

can you provide me with more data? the RCS graph with frequency, the number
of unknowns with frequency, the number of iterations per frequency.

On Tue, Jul 10, 2018 at 8:03 AM, Ticket 2 2@bugs.puma-em.p.re.sourceforge.net wrote:

---

• [bugs:#2] https://sourceforge.net/p/puma-em/bugs/2/ Abrupt change of
  monostatic RCS as a function of frequency*

Status: open
Group: v1.0_(example)
Created: Tue Jul 10, 2018 06:03 AM UTC by Anonymous
Last Updated: Tue Jul 10, 2018 06:03 AM UTC
Owner: nobody

When calculating the monostatic RCS of a metal cube with edge length L =
50 mm as a function of frequency f, the RCS shows the expected behaviour of
RCS ~ f^2 for frequencies f < 23.4 GHz.
For frequencies above 23.4 GHz. This is equivalent to k0 * L = 24.5.
I am using the mesh coming with Puma in the /geo folder and setting the
edge length of via the lx, ly and lz parameters in
simulation_parameters.py. The mesh is set to have a "fineness" of lambda/10.

What kind of problem can occur at relatively high frequencies k0 * L >> 1?

Best regards!

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[Anonymous]